#include<stdio.h>

int kan(int n){
    int i = 0;
    while(n!=1){
        if(n%2==0){
            n = n/2;
        }else{
            n = (3*n+1)/2;
        }
        i++;
    }
    return i;
}

int main(){
    int n=0;
    scanf("%d",&n);
    printf("%d",kan(n));
}